Senior Backend Software Engineer

About the company Our client is a healthcare technology company. The role Raydar is recruiting for this role on behalf of our client. Serve as the lead backend engineer for an early-stage software platform, owning system design, reliability and delivery across a range of high-stakes services. The work spans real-time data processing, transaction handling and payment flows, with broad architectural influence from day one. What you'll do - Own the full backend, including APIs, database design, access controls, backups, staging environments, monitoring and deployments. - Build and operate a real-time pricing service that collects data from several sources on a frequent schedule and routes requests to the best option. - Manage data flowing in and out of a third-party processing system where errors have immediate real-world consequences. - Design and build an in-house processing engine, validating it against the existing system using replayed production traffic until results match. - Own payment infrastructure for incoming and outgoing fund flows, meeting strict uptime targets. - Make foundational architecture and schema decisions so the platform scales smoothly as usage grows many times over. Requirements What we're looking for - 3+ years of backend engineering experience with strong architecture skills. - Experience owning production systems where downtime or errors directly affect revenue, such as payments, ledgers, trading or critical infrastructure. - Background in backend-focused full-stack work, system architecture and database schema design. - Comfort working as the sole engineer in an early-stage startup environment. - Proficiency with AI-assisted development tools. - Confidence to challenge technical decisions and give candid pushback to a strong-minded founder. - Ability to work in person from the New York office. - A computer science or related degree is preferred. Bonus points - Experience at a well-regarded fintech or infrastructure startup. Benefits Compensation and benefits - Base salary: USD 210,000 to 260,000 per year - Equity Location and work model - New York, NY, United States - On-site - Full-time